Ping.fm is a service so you can post to multiple services at the same time. it includes awareness (microblogging) services like Twitter and Jaiku, Social Messaging services like Pownce and more to come. it does this by providing you with a e-mail address where you can send your notes and then they will be published around in the services you have selected. the service has not launched yet, but we got invites for Widgets lab readers if any of you is interested on that alone.
But the true reason you may get interested is because it offers a widget, in this case a iGoogle Gadget, so you can post directly from the iGoogle Start page, and if this is your Startpage of choice and you are interesting in cross posting, then you will like this iGoogle Gadget.
You can get the Ping.fm iGoogle Gadget here: